Remove six from pydiffx.

Review Request #12560 — Created Aug. 20, 2022 and submitted — Latest diff uploaded

Information

DiffX
master

Reviewers

This removes the dependency on six from the codebase. Now that this is
fully on Python 3, we no longer need to depend on this.

Our usage was pretty minimal. This updates everything to use raw types
and native functions.

Unit tests passed.

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